Air handler troubleshooting guides

9 guides. Troubleshooting guides for air handler equipment. Each one lists the likely causes and what to check, in order.

Goodman (3)

• Blower not running - R-32 AMST/AWSF EEM air handler
  Indoor blower (EEM/constant-torque motor) does not start on a fan, cooling or heat call.
• No electric heat - R-32 air handler heat kit
  Heat strips do not come on during an auxiliary/emergency heat call.
• Outdoor unit not communicating - ComfortBridge AVPTC/MBVC
  Communicating system where the outdoor unit does not run or the air handler shows a communication error (EC1). Uses the on-board red communications LE

Lennox (1)

• Two horizontal lines on display (soft disable) - Lennox communicating
  The control shows two horizontal lines on its 7-segment display (damper module or EIM: green LED 3 s on / 1 s off). The thermostat found a device it d

Rinnai (4)

• Circulator pump does not run
  The external pump on the hydronic loop does not start on a call for heat.
• Heat comes out in fan-only mode
  Warm air is delivered when only the fan is on and there is no call for heat.
• Insufficient or no heat
  The air handler runs but delivers little or no heat from the hydronic coil.
• Pump noisy at start-up
  The pump makes noise when it starts.

Trane (1)

• Reading and clearing fault history - Trane P0V0 modular blower
  Same button logic as the furnace control, on the modular blower control.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.